JP2013048728A - Underpants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously materialize both a fitting property by high contact pressure and a soft feeling.SOLUTION: In this underpants type disposable diaper, a material forming at least the outer face of an exterior sheet 12 of the front part F is a nonwoven fabric having compression resilience RC ≥70% and bending resistance in the width direction of 15-30 mm, and a partial region fd in the longitudinal direction in at least a waist lower region fi, fd of a longitudinal direction region T having a side seal part 12A in the exterior sheet 12 of the front part F is a high contact pressure and low contraction coefficient region having high contact pressure and a low contraction coefficient in the width direction as compared with the region fi except the region fd.

Description

  The present invention relates to a pants-type disposable diaper.

  The pants-type disposable diaper includes an exterior sheet constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined to form a side seal portion, and a waist opening and a pair of left and right leg openings are formed. Hereinafter, the fixing portion between the exterior sheet and the interior body is also referred to as an inner / outer fixing portion. As the exterior sheet, a sheet formed by laminating a nonwoven fabric is generally used.

  In a pants-type disposable diaper, in order to improve fit to the body, various elastic elastic members are fixed to the exterior sheet in a stretched state. In general, those having an elongated elastic stretchable member extending along the width direction over almost the entire longitudinal region) (Patent Document 1 and the like).

  In addition, while the contact pressure in the waist edge region is generally relatively high, by increasing the contact pressure in the wearer's iliac region and lower abdomen contact region, It has also been proposed to make a good fit with respect to the stomach that has been put out to prevent slippage (see Patent Document 1).

JP 2006-061681 A

However, when the contact pressure of the elastic elastic member in the iliac region or the lower abdomen contact region is increased, if a flexible material is simply used for the exterior sheet to give a soft product texture, ) Has a problem that the texture of the product becomes hard.
Therefore, the main problem of the present invention is to achieve both a fit by a high contact pressure and a flexible texture.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
An interior body including an absorbent body is fixed to the central portion in the width direction inside the exterior sheet,
The exterior sheet is formed of a nonwoven fabric,
Of the front body exterior sheet, the longitudinal region having the side seal portion includes a front waist edge region that forms an edge of a waist opening, and a waist lower region located on the crotch side from the front waist edge region. And is configured to elastically expand and contract in the width direction,
In pants-type disposable diapers,
The outer body sheet of the front body is a nonwoven fabric in which the material forming at least the outer surface is compression resilience RC70% or more and the bending resistance in the width direction is 15 to 30 mm,
Of the longitudinal region having the side seal portion in the outer body sheet of the front body, at least a partial region in the longitudinal direction in the lower waist region has a higher contact pressure than other regions and a shrinkage rate in the width direction. It is considered as a low high contact pressure and low shrinkage region,
A pants-type disposable diaper characterized by that.

(Function and effect)
When a flexible material is used for the exterior sheet having the high contact pressure region, the shrinkage rate of the exterior sheet in the high contact pressure region is increased, and the exterior sheet is hardened by increasing the density. On the other hand, in the present invention, not only a high contact pressure but also a high contact pressure and low shrinkage rate region in which the shrinkage rate in the width direction is reduced is excellent in fit, but flexible. A texture can be obtained.

<Invention of Claim 2>
The pants-type disposable diaper according to claim 1, wherein the high contact pressure and low shrinkage rate region has a contact pressure of 8 to 11 gf / cm ² and a widthwise shrinkage of 100 to 170%.

(Function and effect)
The contact pressure and the shrinkage ratio in the width direction can be determined as appropriate, but in a normal pants-type disposable diaper, it is preferable to be within this range in order to achieve both fit and high softness due to high contact pressure.

<Invention of Claim 3>
The front body exterior sheet includes a plurality of elongated front waist edge elastic elastic members extending in the width direction and spaced apart in the longitudinal direction at the front waist edge region, and a waist lower part. An elongated waist lower elastic elastic member along a number of width directions fixed in a width direction extended state with a space in the vertical direction in the region,
Of the longitudinal region having the side seal portion in the outer body sheet of the front body, the high contact pressure / low shrinkage rate region has a lower elongation rate or unit of the waist lower elastic elastic member than other regions. The pants-type disposable diaper according to claim 1 or 2, wherein the number of the waist lower elastic elastic members per longitudinal length is small and the thickness of the waist lower elastic elastic members is thick.

(Function and effect)
The high contact pressure and low shrinkage rate region can be formed by an appropriate method, but the method for appropriately adjusting the elongation rate, the number per unit length in the longitudinal direction of the waist, and the thickness as described above is simple. It is preferable because it can be designed.

<Invention of Claim 4>
The front body exterior sheet includes a plurality of elongated front waist edge elastic elastic members extending in the width direction and spaced apart in the longitudinal direction at the front waist edge region, and a waist lower part. An elongated waist lower elastic elastic member along a number of width directions fixed in a width direction extended state with a space in the vertical direction in the region,
Of the longitudinal region having the side seal portion in the outer body sheet of the front body, the high contact pressure low shrinkage rate region has a lower elongation rate when the waist lower elastic elastic member is fixed than other regions. The pants-type disposable diaper according to any one of claims 1 to 3, wherein the waist lower elastic elastic member is natural rubber.

(Function and effect)
Natural rubber has a smaller difference between the SS curve when stretched and the SS curve when shrunk compared to synthetic rubber (that is, the difference between tensile strength (outward) and tensile strength (reverse) at the same elongation (strain)). Because the contact pressure can be maintained high even if the expansion ratio of the lower elastic waist elastic member is lowered in the high contact pressure / low shrinkage region, the thickness does not need to be increased (may be increased). Contact pressure can be obtained. Therefore, problems such as deterioration in appearance due to locally thickening of the waist lower elastic elastic member in the high contact pressure and low shrinkage rate region can be suppressed.

<Invention of Claim 5>
At least the high contact pressure low shrinkage rate region in the outer body sheet of the front body is formed by sandwiching an elastic elastic member between an outer nonwoven fabric that forms an outer surface and an inner nonwoven fabric that is bonded to the inner surface, The underpants-type disposable diaper according to any one of claims 1 to 4, wherein the bending resistance of the inner nonwoven fabric in the width direction is higher than the bending resistance of the outer nonwoven fabric in the width direction.

(Function and effect)
In this way, at least the high contact pressure and low shrinkage rate region has a two-layer structure of nonwoven fabric, the outer nonwoven fabric is made of a flexible material, and the inner nonwoven fabric is made of a higher bending resistance, so that the high contact pressure and low shrinkage rate region Even if it does not change the expansion rate etc. of the elastic expansion-contraction member in, and it changes, it can be set as a low shrinkage rate, suppressing the change to the minimum.

<Invention of Claim 6>
In the high contact pressure and low shrinkage rate region, the waist lower elastic elastic member extends to the vicinity of the side edge of the inner / outer fixing part having a narrower width than the front and rear sides and the width of the inner / outer fixing part. The underpants type disposable diaper of any one of Claims 1-5 in which is provided.

(Function and effect)
Thus, by narrowing the width of the inner and outer fixing portions locally in the high contact pressure and low contraction rate region and widening the attachment range of the waist lower elastic elastic member only by that portion, the range of contraction force action of the waist lower elastic elastic member is increased. It can be enlarged, and the reduction in stretchability due to the low shrinkage can be compensated. Therefore, the contact pressure in the high contact pressure / low contraction rate region can be further reduced. In addition, the width of the inner and outer fixing portions is not narrowed in the entire longitudinal range having the waist lower elastic elastic member, but only a part (high contact pressure and low shrinkage rate region) of the inner and outer fixing portions is narrower than the front and rear sides. The fixing between the interior body and the exterior sheet is not insufficient.

<Invention of Claim 7>
The lower waist region of the front body exterior sheet is located on the crotch side with respect to the front waist edge region, and a lower butt portion that contacts the iliac region of the wearer and the lower abdomen of the wearer. And has an abdomen contact area, and each elastically expands and contracts in the width direction.
The pants-type disposable diaper according to any one of claims 1 to 6, wherein the lower abdomen contact region is the high contact pressure / low contraction rate region.

(Function and effect)
The lower abdomen is the region in which the lower abdomen contact region is the most difficult to shift because the stomach is significantly less expanded and contracted and deformed due to the movement of the body before and after meals and the body than the iliac region on the upper side. Therefore, a diaper can be firmly supported with respect to a body by making the contact pressure of this lower abdomen contact area the highest. Further, since the tightening force of the iliac abutment region is relatively weak, it can flexibly follow the expansion and contraction and deformation of the stomach. The iliac region refers to the region from the iliac crest to the upper anterior iliac spine, and the lower abdomen is the combined portion of the pubic region and the buttocks. It means the place that touches the thigh.

  As described above, according to the present invention, there are advantages such as being able to achieve both a fit with a high contact pressure and a flexible texture.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a perspective view which shows roughly only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1-8 has shown an example of the underpants type disposable diaper. This pants-type disposable diaper is composed of an exterior sheet 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior sheet 12. The inner / outer fixing portion for fixing is denoted by reference numeral 300 in FIG. Symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the deployed state. The full width of is shown.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the joining part which joins each structural member, and these joining parts include the inside and outside fixing | fixed part 300, solids, such as a hot-melt-adhesive, a bead, a curtain, a summit, spiral application, etc. It is formed by. Also, “front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) orthogonal to the front-rear direction. The “vertical direction” means the state in which the diaper 100 is worn, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back of the diaper 100 overlap each other. In other words, it means the direction connecting the waist opening WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .
Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
When providing the three-dimensional gather 60, both sides of the surface sheet 30 pass between the liquid-impermeable back sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.
The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.
The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.
Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.
Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. When the shape is formed, it is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.
Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) of 40 g / g or more are preferable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate (JIS K7224-1996 water absorption rate test method for superabsorbent resin) of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, the waist opening WO for passing the wearer's torso and the left and right sides for passing the legs are joined. A pair of leg openings LO is formed. The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T that is defined as a vertical region (a vertical region extending from the waist opening WO to the upper end of the leg opening LO) and a front-rear direction region of a portion that forms the leg opening LO. An intermediate portion L defined as (between the front-rear direction region having the side seal portion 12A of the front body F and the front-rear direction region having the side seal portion 12A of the rear body B).

  The waistline T includes a front waist edge area fw and a rear waist edge bw (area corresponding to the front waist edge area) that form the edge of the waist opening, and a waist lower area fi located on the crotch side. , Fd and bi, bd, and the lower waist region fi, fd, bi, and bd are the iliac contact region fi and the posterior intermediate region bi (iliac contact) that contact the wearer's iliac region. A region corresponding to the region), a lower abdomen contact region fd that contacts the lower abdomen of the wearer, and a rear lower end side region bd (portion corresponding to the lower abdomen contact region). It is configured to elastically expand and contract.

  The vertical lengths of these regions vary depending on the size of the product and can be determined as appropriate. For example, the vertical lengths of the front waist edge region fw and the rear waist edge bw are 2 to 12 of the total length Y of the diaper. %, The longitudinal length of the iliac abutment region fi and the posterior intermediate region bi is about 2 to 14% of the diaper overall length Y, and the longitudinal length of the lower abdomen abutment region fd and the posterior lower end side region bd is the diaper overall length. It can be about 5 to 19% of Y. In particular, when the longitudinal length of the side seal portion 12A is 20 to 30% of the total length of the diaper, for example, the longitudinal lengths of the front waist edge region fw and the rear waist edge portion bw are about 2 to 10% of the total length Y of the diaper. The longitudinal length of the iliac abutment region fi and the posterior intermediate region bi is about 4 to 12% of the diaper overall length Y, and the longitudinal length of the lower abdomen abutment region fd and the posterior lower end side region bd is the diaper overall length Y. It can be about 8 to 15%.

  On the other hand, the intermediate portion L is bound so that both side edges extend around the legs of the wearer, and this is a portion into which the wearer's legs are put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  In the illustrated embodiment, the outer sheet 12 has a rubber thread between the outer nonwoven fabric 12S forming the outer surface and the inner nonwoven fabric 12H bonded to the inner surface in order to make each region elastically stretchable in the width direction. And the like are formed so as to be sandwiched. In particular, in the illustrated form, the inner nonwoven fabric 12H located on the inner side extends only to the edge of the waist opening WO, but the outer nonwoven fabric 12S wraps around the edge on the waist side of the inner nonwoven fabric 12H and is folded inside. The folded portion 12r extends so as to cover the end on the waist side of the interior body 200. However, the present invention is not limited to this, and other known structures are used to incorporate the elastic elastic member. Can do.

The outer nonwoven fabric 12S and the inner nonwoven fabric 12H can be used without particular limitation as long as they are nonwoven fabrics, and the raw fiber is not particularly limited, and examples thereof include olefins such as polyethylene and polypropylene, polyesters, polyamides, and the like. Synthetic fibers, regenerated fibers such as rayon and cupra, natural fibers such as cotton, mixed fibers and composite fibers in which two or more of these are used can be used. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. Each basis weight of the outer nonwoven 12S and the inner nonwoven 12H is preferably set to 10 to 30 g / m ² approximately.

  As the elongated elastic elastic members 14 to 20 provided between the outer nonwoven fabric 12S and the inner nonwoven fabric 12H, synthetic rubber or natural rubber may be used. For bonding the outer nonwoven fabric 12S and the inner nonwoven fabric 12H of the exterior sheet 12 and fixing the elongated elastic elastic members 14 to 20 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do.

More specifically, between the inner side surface of the inner nonwoven fabric 12H and the outer side surface of the folded portion 12r of the outer nonwoven fabric 12S in the front waist edge region fw and the rear waist edge region fw, the entire width direction is continuous. A plurality of front waist edge elastic elastic members 17 and a plurality of rear waist edge elastic elastic members 17 are fixed in a state where they are extended in the width direction at a predetermined extension rate with a space in the vertical direction. . Of the front waist edge elastic elastic member and the rear waist edge elastic elastic member 17, one or a plurality of elastic members arranged on the crotch side may overlap with the interior body 200, or the interior body 200. They may be provided on both sides in the width direction except for the central portion in the width direction that overlaps with each other. The front waist edge elastic elastic member 17 and the rear waist edge elastic elastic member 17 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1). .5 mm ² , especially about 0.1 to 1.0 mm ² ), and 3 to 22 thread rubbers with an interval of 4 to 12 mm, and an elongation rate of 150 to 400%, particularly about 220 to 320%, respectively. Can do. Further, the front waist edge elastic elastic member and the rear waist edge elastic elastic member 17 need not all have the same thickness and elongation rate. For example, the thickness of the elastic elastic member at the upper and lower portions of the waist edge W The expansion rate may be different.

Moreover, the width direction both sides except for the center part of the width direction which overlaps the interior body 200 between the outer surface of the inner side nonwoven fabric 12H and the inner side surface of the outer side nonwoven fabric 12S in the iliac contact region fi and the rear intermediate region bi. A plurality of iliac elastic elastic members 19 and posterior intermediate elastic members 15 each made of an elongated elastic elastic member, and are spaced apart in the vertical direction so as to be continuous over the entire width direction of each part of It is fixed in an expanded state along the width direction at an expansion rate. The iliac elastic member 19 and the posterior intermediate elastic member 15 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm). ² , especially about 0.1 to 1.0 mm ² ), about 1 to 15 mm, especially about 3 to 30 at an interval of 3 to 8 mm, respectively, with an elongation of about 200 to 350%, especially about 240 to 300%. Can be fixed.

Further, the width direction of the lower abdomen contact region fd and the rear lower end side region bd is the width direction except for the central portion in the width direction that overlaps the inner body 200 between the outer surface of the inner nonwoven fabric 12H and the inner surface of the outer nonwoven fabric 12S. A plurality of lower abdomen elastic elastic members 20 and rear lower end side elastic elastic members 14 made of an elongated elastic elastic member are respectively provided in the width direction of each part on both sides, spaced apart in the vertical direction, and predetermined It is being fixed in the state extended | stretched along the width direction with the expansion | extension rate of. The lower abdomen elastic elastic member 20 and the rear lower end elastic elastic member 14 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm). ² , especially about 0.1 to 1.0 mm ² ), about 1 to 15 mm, especially about 3 to 30 at an interval of 3 to 8 mm, respectively, with an elongation of about 200 to 350%, especially about 240 to 300%. Can be fixed.

Furthermore, in the illustrated form, between the outer side surface of the inner nonwoven fabric 12H and the inner side surface of the outer nonwoven fabric 12S in the intermediate portion L of the front body F and the rear body B, except for the widthwise central portion that overlaps the inner body 200, A plurality of intermediate elastic elastic members 16 and 18 made of an elongated elastic elastic member are continuously provided in the respective parts on both sides in the width direction over the entire width direction, with a predetermined extension rate at intervals in the vertical direction. It is fixed in the state extended | stretched along the width direction. The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to Thread rubber of about 1.0 mm ² ) can be fixed at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the drawing, the iliac elastic elastic member 19 and the rear intermediate elastic elastic member 15, the lower abdominal elastic elastic member 20, the rear lower elastic elastic member 14, and the intermediate elastic elastic members 16 and 18 are provided in the interior body. If it is provided on both sides in the width direction except for the central portion in the width direction that overlaps with 200, the interior body 200 will not shrink more than necessary in the width direction, and the appearance will be poor and the absorbency will be reduced. There is nothing to do. In this form, in addition to the form in which the elastic elastic members 14 to 16 and 18 to 20 exist only on both sides in the width direction, the elastic elastic members 14 to 16 and 18 cross the interior body 200 from one side in the width direction to the other side. However, the elastic elastic members 14 to 16 and 18 to 20 are finely cut at the central portion in the width direction overlapping the interior body 200, and the contraction force does not act (substantially, the elastic elastic member is It is equivalent to not providing) that includes a configuration in which only both sides in the width direction are configured as contraction force acting portions. Of course, the arrangement form of the elastic stretch members 14 to 16 and 18 to 20 is not limited to the above example, and the elastic stretch members 14 to 16 so that the stretch force acts over the entire width of the front body F and the back body B. , 18 to 20 can be provided from one side to the other side in the width direction across the interior body 200.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but as shown in FIG. 9, the exterior sheet 12 covers the abdomen side of the waist of the wearer. It is divided into an abdominal exterior sheet 12F that covers and a back exterior sheet 12B that covers the back side, and the front end of the interior body 200 is connected to the inner surface of the central part in the width direction of the abdominal exterior sheet 12F by a hot melt adhesive or the like. In addition, the rear end portion of the interior body 200 is connected to the inner surface of the central portion in the width direction of the back side exterior sheet 12B by a hot melt adhesive or the like, and the abdominal side exterior sheet 12F and the back side exterior sheet 12B are on the crotch side. It is also possible to adopt a form that is not continuous and spaced apart. This separation distance can be about 150 to 250 mm. In this case, the back surface of the liquid-impervious backsheet in the interior body 200 is a part of the portion exposed so as to cover the entire back surface of the interior body 200 or between the ventral exterior sheet 12F and the back exterior sheet 12B. The crotch outer sheet can also be fixed so as to cover a part or the whole. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.
At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.
Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(About high contact pressure, low shrinkage area, etc.)
Characteristically, the outer sheet 12 of the front body F has a compression resilience RC of 70% or more, preferably about 70 to 80%, and a width direction of at least the material forming the outer surface (in the illustrated example, the outer nonwoven fabric 12S). The nonwoven fabric has a bending resistance of 15 to 30 mm, preferably 20 to 25 mm. A method for measuring the compression resilience and the bending resistance is as described later. When the exterior sheet 12 of the front body F and the exterior sheet 12 of the back body B are integrally formed of a common material as illustrated, the exterior sheet 12 of the back body B has the same material configuration. Although it is desirable, it can also be made different (especially suitable in the case of the exterior sheet 12 division structure mentioned later). Examples of such a non-woven fabric having compression resilience and bending flexibility include a spunbonded non-woven fabric having a basis weight of about 15 to 20 g / m ² made of polypropylene fiber having a fineness of ² to 3 dtex.

  Further, characteristically, in the waistline portion T of the exterior sheet 12 of the front body F, at least some of the vertical regions in the waist lower regions fi and fd have a higher contact pressure than the other regions. It is a high contact pressure / low shrinkage rate region where the shrinkage rate in the width direction is low. The method for measuring the contact pressure and the shrinkage rate is as described later. The high contact pressure / low contraction rate region may be a part or the whole as long as it is within the waist lower region fi, fd. Although it may be a part straddling the contact area fi and the lower abdomen contact area fd, the lower abdomen contact area fd is particularly preferable. When a flexible material is used for the exterior sheet 12 having a high contact pressure region, the shrinkage rate of the exterior sheet 12 in the high contact pressure region is increased and becomes harder as the exterior sheet 12 is densified. Not only the high contact pressure but also the high contact pressure / low shrinkage rate region in which the shrinkage rate in the width direction is reduced makes it possible to obtain a flexible texture while having excellent fit.

The contact pressure and the shrinkage ratio in the width direction in the high contact pressure / low shrinkage rate region can be determined as appropriate. However, in a normal pants-type disposable diaper, when the fit property by the high contact pressure and the soft texture are compatible, the contact pressure is 8 ˜11 gf / cm ² , particularly 9 to 10 gf / cm ² , and the widthwise shrinkage is preferably 100 to 170%, particularly preferably 120 to 140%. Further, the high contact pressure and low shrinkage rate region has a contact pressure of about 1.5 to 2.5 times, particularly 1.7 to, compared to regions other than the high contact pressure and low shrinkage rate regions in the waist lower regions fi and fd. It is preferable that the contraction rate in the width direction is about 1.5 to 2.0 times, particularly about 1.7 to 1.8 times.

The particularly preferable magnitude relation of the contact pressure in each region is as follows. That is, in the exterior sheet 12, the contact pressure of the front waist edge region fw is F _fw , the contact pressure of the iliac contact region fi is F _fi , the contact pressure of the lower abdomen contact region fd is F _fd , and the rear lower end side When the contact pressure in the region bd is F _bd , it is preferable to satisfy the relationship of F _fd > F _fw > F _{fi and} the relationship of F _fd > F _bd . Thus, when the contact pressure F _fd of the lower abdomen contact region fd is configured to be larger than the contact pressure F _bd of the rear lower end side region bd corresponding to the lower abdomen contact region fd, the region that contacts the swelling of the buttocks Since the rear lower end side region bd is strongly pulled forward by the lower abdomen contact region fd of the front body F and is expanded in the left-right direction, and the movement to the rupture side is suppressed, In addition, it is difficult to cause a situation in which the rear gathers 60, 60 that should be positioned on the outer side in the width direction are shifted to the burst side and fall down.

Also, if the front and rear contact pressures are varied taking into consideration only the back body B, the fit of the front body F may be reduced, and as a result, the back body B may be easily displaced. The contact pressure F _fd in the contact region fd is made the strongest, then the contact pressure F _fw in the front waist edge region _fw is made strong, and the contact pressure in the iliac contact region fi is made the weakest F _fi (in this respect, the cited document) In contrast, the fit of the front body F is significantly improved, and as a result, the rear body B is more difficult to shift. That is, the lower abdomen is the region where the lower abdomen abutment region fd is the most difficult to shift because the stomach is not significantly expanded or contracted or deformed due to the movement of the body before or after eating or the body compared to the iliac region on the upper side. Therefore, the diaper can be firmly supported on the body by making the contact pressure in the lower abdomen contact region fd the highest. In addition, by making the contact pressure of the iliac contact region fi the lowest, it is possible to flexibly follow the expansion and contraction and deformation of the stomach. Furthermore, if the contact pressure of the iliac contact region fi is weakened, the displacement tends to drop, but the contact pressure of the front waist region fw is stronger than that of the iliac contact region fi, and the contact of the lower abdomen contact region fd. Since the pressure is the strongest, the regions on both sides in the longitudinal direction of the iliac contact region fi are supported, and the iliac contact region fi can be prevented from being displaced. Therefore, both the static fit and the dynamic fit in the front body F are improved, and the effect of preventing slippage is excellent. As a result, the back body B is more difficult to slip.

In the exterior body 12 of the back body B, the contact pressure of the rear waist edge region bw, the rear intermediate region bi, and the rear lower end side region bd can be appropriately determined, but the contact pressure of the rear waist edge region bw is F _bw , When the contact pressure of the rear intermediate region bi is F _bi , the _inner body 200 is preferably configured so as to satisfy the relations of F _bw = F _fw and F _bi ≦ F _fi. The rear end portion of the rear intermediate region bi corresponding to the rear end portion has a lower contact pressure (F _bi <F _fi ) than the portion corresponding to the rear end portion of the rear intermediate region bi in the iliac contact region fi. preferable. As a result, the rear end portion of the interior body 200 is strongly pulled forward by the iliac abutment region fi of the front body F and deployed in the left-right direction. The movement to the crack side is further suppressed. Thereby, it can further prevent that the interior body 200 of the back body B shifts to the rupture side.

Although the contact pressure of each region can be determined as appropriate, when the present inventors have experimented, the contact pressure F _fw of the front waist edge region _fw is 4 to 7 gf / cm ² , particularly about 5 to 6 gf / cm ² , The contact pressure F _fi of the iliac contact region fi is 3 to 6 gf / cm ² , especially about 4 to 5 gf / cm ² , and the contact pressure F _fd of the lower abdomen contact region _fd is 8 to 11 gf / cm ² , particularly 9 to is preferably from 10 gf / cm ² or so, the contact pressure F _bw of the rear waist edge region bw is 4~7gf / cm ^2, particularly 5~6gf / cm ² or so, the contact pressure F _bi rear intermediate region bi 2 ~5gf / cm ^2, particularly 3~4gf / cm ² or so, the contact pressure F _bd the lower rear end side region bd is 8~11gf / cm ^2, is preferably particularly 9~10gf / cm ² approximately.

On the other hand, it is preferable that the particularly preferable relationship between the shrinkage rates of the respective regions is opposite to the relationship between the contact pressures. Specifically, the relationship is as follows. That is, in the exterior sheet 12, the contraction rate of the front waist edge region fw is C _fw , the contraction rate of the iliac contact region fi is C _fi , the contraction rate of the lower abdomen contact region fd is C _fd , and the rear lower end side When the contraction rate of the region bd is C _bd , it is preferable that the relationship of C _fd <C _fw <C _{fi and} the relationship of C _fd <C _bd are satisfied. Further, in the outer sheet 12 of the back body B, when the shrinkage of the rear waist edge region bw C _bw, and the shrinkage of the rear intermediate region bi was _{C bi, C bw = C fw} , and C _bi ≧ C preferably the is configured to satisfy the relation _fi, in particular, the intermediate region bi rear portion after the corresponding rear end portion of the inner body 200 in the rear middle region bi is the rear middle region in the iliac contact area fi It is preferable that the contraction rate is higher (C _bi > C _fi ) than the portion corresponding to the bi rear end.

The contraction rate of each region can be determined as appropriate. However, according to experiments conducted by the inventor, the contraction rate C _fw of the front waist edge region _fw is 120 to 190%, particularly about 140 to 160%. The contraction rate C _fi of the region fi is 105 to 175%, particularly about 125 to 145%, and the contraction rate C _fd of the lower abdomen contact region fd is preferably about 100 to 170%, particularly about 120 to 140%. The shrinkage rate C _bw of the waist edge region bw is 120 to 190%, particularly about 140 to 160%, and the shrinkage rate C _bi of the rear intermediate region _bi is 110 to 180%, particularly about 130 to 150%, and the rear lower end side region bd The shrinkage ratio C _bd is preferably about 110 to 180%, particularly about 130 to 150%.

  The magnitude relationship of the contact pressure and the magnitude relationship of the shrinkage rate in the exterior sheet 12 can be established by a known method. For example, as shown in the drawing, the outer nonwoven fabric 12S and the inner nonwoven fabric 12H are bonded together with an adhesive such as a hot melt adhesive to form the exterior sheet 12, and the outer nonwoven fabric 12S in each region fw, fi, fd, bw, bi, bd. In the case of the structure in which the elongated elastic stretch members 14 to 20 such as thread rubber are provided between the inner nonwoven fabric 12H and the elastic stretch members 14 to 20 in each region fw, fi, fd, bw, bi, bd, the unit This is preferable because the method of appropriately adjusting the number per unit length, thickness, and expansion / contraction characteristics (SS curve) is simple. Specifically, in the high contact pressure / low contraction rate region, the elastic expansion / contraction member (when the high contact pressure / low contraction rate region is defined as the lower abdomen contact region fd, the lower abdomen elastic expansion / contraction member 20 is obtained). When the high contact pressure and low contraction rate region is the iliac contact region fi, it is the iliac elastic member 19 (the same applies hereinafter)) or the elastic expansion / contraction per unit length in the longitudinal direction. Reducing the number of members and increasing the thickness of the elastic expansion / contraction member is one preferred form in that the design is simple.

  Further, in the high contact pressure / low shrinkage ratio region, it is also one preferable form that the elastic expansion / contraction member is made to have a low expansion rate and the elastic expansion / contraction member is made of natural rubber as compared with other regions. Natural rubber has a smaller difference between the SS curve when stretched and the SS curve when shrunk compared to synthetic rubber (that is, the difference between tensile strength (outward) and tensile strength (reverse) at the same elongation (strain)). Therefore, even if the expansion rate of the elastic elastic member in the high contact pressure / low shrinkage rate region is low, the contact pressure can be maintained high, so that the contact pressure is high (thickness can be increased). Can be obtained. Therefore, problems such as deterioration in appearance due to locally thickening of the elastic elastic member in the high contact pressure / low shrinkage rate region can be suppressed.

  Furthermore, when the outer nonwoven fabric 12S and the inner nonwoven fabric 12H are bonded to each other with an adhesive such as a hot melt adhesive to form the exterior sheet 12, the outer nonwoven fabric 12S is made of a flexible material, and the bending resistance of the inner nonwoven fabric 12H in the width direction is increased. It is also a preferable form to make it higher than the bending resistance in the width direction of the outer nonwoven fabric 12S. Thereby, even if it does not change the expansion rate etc. of the elastic expansion-contraction member in a high contact pressure low shrinkage rate area | region, and it changes, it can be set as a low shrinkage rate, suppressing the change to the minimum.

  Of course, each region is formed by joining different members, or stretchable nonwoven fabric (meaning that the nonwoven fabric itself elastically expands and contracts at least in the width direction without the addition of an elastic stretchable member such as thread rubber). 156785 and JP-A-2001-200460, etc.) and a sheet-like elastic expansion / contraction member such as a rubber sheet, etc. By adopting the well-known method, it is possible to construct the magnitude relationship of the contact pressure and the magnitude relationship of the shrinkage rate in the exterior sheet 12.

  Moreover, the means for constructing the above-described contact pressure magnitude relationship and the contraction rate magnitude relationship can be used in appropriate combination.

(Large elastic part)
As shown in FIG. 6, the region of the inner / outer fixing portion 300 that fixes the outer sheet 12 and the inner body 200 is a high contact pressure / low contraction rate region (in the example shown in FIG. 6, the lower abdomen abutment). The width X2 of the portion 301 located in the region fd) is configured to be narrower than both the front and rear sides thereof, and in the front body F, the lower abdomen elastic elastic member 20 extends to the vicinity of the side edge of the narrow inner / outer fixing portion 301. It is preferable that the width of the elastic expansion / contraction range in the high contact pressure / low contraction rate region is wider than both the front and rear sides. In particular, in the inner / outer fixing portion 300, both side edges of the portion 304 located in the rear lower end side region bd are located in the vicinity (or the same) of both side edges of the interior body. The width X2 of the portion 301 located in the contraction rate region is configured to be narrower than the width X3 of the portion 304 located in the rear lower end side region bd, and in the rear body B, in the vicinity of the side edge of the wide inner / outer fixing portion 304 It is more preferable that the rear lower end side elastic elastic member 14 is extended to the end. Hereinafter, the longitudinal direction region of the wide elastic stretchable range is also referred to as a large stretchable portion EX.

  The range in which the large expansion / contraction part EX is provided is not only the high contact pressure / low shrinkage rate region, but also the region other than the high contact pressure / low shrinkage rate region in the waist lower regions fi and fd as long as the high contact pressure / low shrinkage rate region is included. Therefore, in the illustrated example, a part of the iliac elastic member 19 is extended to the vicinity of the side edge of the narrow inner / outer fixing portion 301 in the front body F, and the rear In the body B, the width of the elastic expansion / contraction range in a part of the iliac abutment region fi is also increased by extending a part of the intermediate elastic expansion / contraction member 15 to the vicinity of the side edge of the wide inner / outer fixing part 304. It is configured wider than the width of the elastic expansion / contraction range in a part of the rear intermediate region bi.

  The longitudinal range of the large stretchable part EX can be determined as appropriate according to the dimensions of the diaper. In normal cases, the rear end (the edge of the waist opening WO of the back body B) of the total length Y of the diaper is 0%. When the front end (the edge of the waist opening WO of the front body F) is defined as 100%, it is preferably in the range of 4 to 30%.

  The width X2 of the inner / outer fixing portion 301 in the large expansion / contraction portion EX can be determined as appropriate, but in a normal case, it is preferably about 7 to 70% of the width X4 of the interior body 200. Incidentally, the width X4 of the interior body 200 can be determined as appropriate, but is preferably about 20 to 50% of the total width X of the diaper.

  The width X3 of the inner and outer fixing portions 304 of the back body B is preferably about 70 to 95% of the width X4 of the interior body 200. The widths of the inner and outer fixing portions 302 and 303 in the portions EF and EB near the front and rear of the large stretchable portion EX are wider than the large stretchable portion EX, for example, approximately the same as the width X3 of the inner and outer fixed portions 304 of the back body B. desirable. In addition, it is preferable that the longitudinal length of the inner and outer fixing portions 302 and 303 on both the front and rear sides EF and EB of the large stretchable portion EX is about 2 to 20% of the total length Y of the diaper. In addition, the dimension of each part of a diaper means the length in the expansion | deployment state which does not shrink | contract by an elastic member fundamentally.

  In addition, when making the end of the width direction center side of the back lower end side elastic elastic member 14 and the iliac part elastic elastic member 19 near the side edges of the inner and outer fixing parts 301, 302, 303, the distance is not particularly limited, In a normal case, it is preferable that the distance from the side edges of the inner and outer fixing portions 301, 302, and 303 is about 30 mm to the center in the width direction and the outer side in the width direction. In this way, when the width of the inner / outer fixing part 300 of the front body F is narrowed at least in the lower abdomen contact area, and the width of the elastic expansion / contraction range is expanded only by that part, the elastic expansion / contraction range narrowed in the rear body is compensated in the front body, Appropriate and sufficient stretchability can be ensured in the entire circumferential direction of the diaper in the longitudinal region corresponding to the swelling of the diaper, and the fit to the heel portion is excellent.

(Crow elastic elastic member)
When the lower abdomen contact region fd is a high contact pressure and low contraction rate region, the urine receiving space in the lower abdomen is reduced, and if there is a large amount of urination rapidly, there is a risk of leakage. Therefore, as shown in the drawing, at least between the inner nonwoven fabric 12H and the outer nonwoven fabric 12S of the exterior sheet 12 (which may be the interior body 200) in the crotch portion, the crotch portion of the interior body 200 expands outward while contracting in the width direction. As shown in FIG. 8, the crotch elastic elastic member 13 to be taken out is provided, and the crotch part of the interior body 200 is bulged outward while being contracted in the width direction, so that the space between the interior body 200 and the wearer's crotch Increasing the space is also a preferred form. As the crotch elastic elastic member 13 in this case, if a large number of elongated elastic elastic members such as thread rubber are provided in the width direction and spaced apart in the vertical direction, the structure is simple and the manufacturing is easy. preferable. Of course, the elastic nonwoven fabric (meaning that the nonwoven fabric itself elastically expands and contracts at least in the width direction without the addition of elastic elastic members such as thread rubber, for example, disclosed in Japanese Patent Application Laid-Open No. 2008-156785 and Japanese Patent Application Laid-Open No. 2001-200460. Etc.) or a sheet-like elastic stretchable member such as a rubber sheet, or a part or all of the region may be elastically stretched.
When an elongated elastic elastic member is used for the crotch elastic elastic member 13, the elastic elastic member has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05). ˜1.5 mm ² (especially about 0.1 to 1.0 mm ² ) of thread rubber is fixed at intervals of 4 to 12 mm at about 3 to 22 stretches of 150 to 400%, particularly about 220 to 320%, respectively. can do.

<Explanation of terms>
The definitions of terms are shown below.
(A) “Elongation rate”
“Elongation rate” is a value when the natural length is 100%, that is, a value represented by [(t1−t) / t] × 100% where t is the natural length and t1 is the length at the time of expansion. Means.
(B) “Shrinkage rate”
“Shrinkage rate” means that the length of the elastic deformation limit (for example, in the case of an exterior sheet, the state where the shrinkage of the nonwoven fabric base material has been stretched and disappeared) is u1, and the natural length is u [(u1-u ) / U] × 100%.
(C) “Compression Resilience (RC)”
Measured by a compression test using a KES-FB3-AUTO-A automated compression tester based on KES (Kawabata = s Evaluation System for Fabrics). Measurements between steel plates with circular plane of compression area 2 cm ^2, the sample was compressed from 0 gf / cm ² to a maximum compressive load 50 gf / cm ^2, carried out between undo. RC is compression resilience and represents compression recovery. The closer the value is to 100, the better the recovery.
(D) “Bending softness”
“Bending softness” is a value measured by a 45 degree cantilever method according to JIS-L-1096.
(E) “Contact pressure”
For contact pressure, a diaper is attached to a cylinder with a circumference of 500 mm (assuming the average length of the infant's belly), a contact pressure measuring instrument (AMI3037-2) manufactured by AIM Techno Co.) and φ = 15 mm. Using an air pack, the contact pressure is measured by setting the air pack so that the entire air pack is within the elastic stretchable region to be measured.
(F) The terms “tensile strength (outward)” and “tensile strength (outward)”
It can be measured using a tensile tester (for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU). Specifically, the corresponding part of the diaper is cut out to prepare a test piece, and a tensile test is performed at 20 ° C. under conditions of 50 mm between chucks and a tensile speed of 300 mm / min. In this case, the tensile strength when extending from zero elongation to the elastic deformation limit (for example, in the case of an exterior sheet, the state in which the shrinkage of the nonwoven fabric base material has been extended) is defined as “tensile strength (outward)”. The tensile strength when returning from the elastic deformation limit to zero elongation is defined as “tensile strength (rebound)”.

  The present invention can be used for a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Impervious back sheet, 12 ... Exterior sheet, 12F ... Abdomen side exterior sheet, 12B ... Back side exterior sheet, 12H ... Inner nonwoven fabric, 12S ... Outer nonwoven fabric, 12r ... Folded portion, 25 ... Print sheet, 200 ... Inner body, 30 ... top sheet, 40 ... intermediate sheet, 50 ... absorbent element, 56 ... absorbent, 58 ... packaging sheet, 60 ... side gather, 62 ... gather sheet, F ... front body, B ... back body, fw ... front waist edge area, fi ... iliac contact area, fd ... lower abdomen contact area, bw ... rear waist edge area, bi ... rear intermediate area, bd ... rear lower end side area.

Claims (7)

The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
An interior body including an absorbent body is fixed to the central portion in the width direction inside the exterior sheet,
The exterior sheet is formed of a nonwoven fabric,
Of the front body exterior sheet, the longitudinal region having the side seal portion includes a front waist edge region that forms an edge of a waist opening, and a waist lower region located on the crotch side from the front waist edge region. And is configured to elastically expand and contract in the width direction,
In pants-type disposable diapers,
The outer body sheet of the front body is a nonwoven fabric in which the material forming at least the outer surface is compression resilience RC70% or more and the bending resistance in the width direction is 15 to 30 mm,
Of the longitudinal region having the side seal portion in the outer body sheet of the front body, at least a partial region in the longitudinal direction in the lower waist region has a higher contact pressure than other regions and a shrinkage rate in the width direction. It is considered as a low high contact pressure and low shrinkage region,
A pants-type disposable diaper characterized by that. The pants-type disposable diaper according to claim 1, wherein the high contact pressure and low shrinkage rate region has a contact pressure of 8 to 11 gf / cm ² and a widthwise shrinkage of 100 to 170%. The front body exterior sheet includes a plurality of elongated front waist edge elastic elastic members extending in the width direction and spaced apart in the longitudinal direction at the front waist edge region, and a waist lower part. An elongated waist lower elastic elastic member along a number of width directions fixed in a width direction extended state with a space in the vertical direction in the region,
Of the longitudinal region having the side seal portion in the outer body sheet of the front body, the high contact pressure / low shrinkage rate region has a lower elongation rate or unit of the waist lower elastic elastic member than other regions. The pants-type disposable diaper according to claim 1 or 2, wherein the number of the waist lower elastic elastic members per longitudinal length is small and the thickness of the waist lower elastic elastic members is thick. The front body exterior sheet includes a plurality of elongated front waist edge elastic elastic members extending in the width direction and spaced apart in the longitudinal direction at the front waist edge region, and a waist lower part. An elongated waist lower elastic elastic member along a number of width directions fixed in a width direction extended state with a space in the vertical direction in the region,
Of the longitudinal region having the side seal portion in the outer body sheet of the front body, the high contact pressure low shrinkage rate region has a lower elongation rate when the waist lower elastic elastic member is fixed than other regions. The pants-type disposable diaper according to any one of claims 1 to 3, wherein the waist lower elastic elastic member is natural rubber.   At least the high contact pressure low shrinkage rate region in the outer body sheet of the front body is formed by sandwiching an elastic elastic member between an outer nonwoven fabric that forms an outer surface and an inner nonwoven fabric that is bonded to the inner surface, The underpants-type disposable diaper according to any one of claims 1 to 4, wherein the bending resistance of the inner nonwoven fabric in the width direction is higher than the bending resistance of the outer nonwoven fabric in the width direction.   In the high contact pressure and low shrinkage rate region, the waist lower elastic elastic member extends to the vicinity of the side edge of the inner / outer fixing part having a narrower width than the front and rear sides and the width of the inner / outer fixing part. The underpants type disposable diaper of any one of Claims 1-5 in which is provided. The lower waist region of the front body exterior sheet is located on the crotch side with respect to the front waist edge region, and a lower butt portion that contacts the iliac region of the wearer and the lower abdomen of the wearer. And has an abdomen contact area, and each elastically expands and contracts in the width direction.
The pants-type disposable diaper according to any one of claims 1 to 6, wherein the lower abdomen contact region is the high contact pressure / low contraction rate region.

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